Explain how evolution as it was conceived of by jean-baptiste lamarck differs from natural selection.

Lamarck’s theory exclaimed that organisms changed during life in order to adapt to their environment and that those changes are heritable (parents will pass them on to their offspring). What makes the biggest difference comparing to natural selection is that he believed that the changes are made by organisms' desire.  

Darwin’s theory (natural selection) disagrees with the influence of animals’ desire on evolution. Darwin explains that variability exist within species and that some traits are more suitable (favorable) to the environment because help an organism to survive and have more offspring. Favorable traits are heritable. Unlike Lamarck, Darwin believed that evolution doesn’t happen according to any sort of plan.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!